What happens when atoms do covalent bonding?

Atoms will covalently bond with other atoms in order to gain more stability, which is gained by forming a full electron shell. Hope this helps.

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explanation:

the cladogram shown here shows similarities and differences among several classes of vertebrates. anatomically, the four have limb structure as their common ancestor. we might separate the mammals from the other three classes because they a) divergent; do not lay eggs b) identical; are warm-blooded c) varied; a four chambered heart d) homologous; have mammary glands